US 11,799,080 B2
Positive electrode active material, method for manufacturing positive electrode active material, and secondary battery
Mayumi Mikami, Kanagawa (JP); Aya Uchida, Tochigi (JP); Yumiko Yoneda, Kanagawa (JP); Yohei Momma, Kanagawa (JP); Masahiro Takahashi, Kanagawa (JP); and Teruaki Ochiai, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Appl. No. 16/611,791
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
PCT Filed May 11, 2018, PCT No. PCT/IB2018/053274
§ 371(c)(1), (2) Date Nov. 7, 2019,
PCT Pub. No. WO2018/211375, PCT Pub. Date Nov. 22, 2018.
Claims priority of application No. 2017-099871 (JP), filed on May 19, 2017.
Prior Publication US 2021/0083281 A1, Mar. 18, 2021
Int. Cl. H01B 1/08 (2006.01); H01M 4/525 (2010.01); C01G 53/00 (2006.01); H01M 4/131 (2010.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 6/16 (2006.01); H01M 10/0525 (2010.01); H01M 4/139 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01B 1/08 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/139 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 6/164 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); H01M 2004/028 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a positive electrode active material comprising lithium, cobalt, and oxygen,
wherein the positive electrode active material has a property that an X-ray diffraction pattern of the positive electrode active material has at least a first peak at 2θ of 19.30±0.20° and a second peak at 2θ of 45.55±0.10°, as analyzed by powder X-ray diffraction with a CuKα1 line in a charged state when charged with a lithium metal counter electrode at 25° C. and at 4.6 V, and
wherein the positive electrode active material further comprises magnesium, fluorine, and titanium,
wherein a discharge capacity retention rate of a coin cell comprising the positive electrode active material is higher than or equal to 74% and lower than or equal to 94% at the 50th cycle of a cycle test at 25° C., the coin cell comprising a lithium metal counter electrode, and
wherein, for each cycle of the cycle test:
a CCCV charge is performed at a current value of 0.5 C and a battery voltage of 4.6V, with a termination current of 0.01 C,
a CC discharge is performed at a current value of 0.5 C until the battery voltage reaches 2.5V, and
1 C is set to 137 mA/g.